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US6474219B2 - Flexible piston rod - Google Patents

Flexible piston rod Download PDF

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Publication number
US6474219B2
US6474219B2 US09/808,497 US80849701A US6474219B2 US 6474219 B2 US6474219 B2 US 6474219B2 US 80849701 A US80849701 A US 80849701A US 6474219 B2 US6474219 B2 US 6474219B2
Authority
US
United States
Prior art keywords
piston rod
flexible piston
spring
flexible
spine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US09/808,497
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English (en)
Other versions
US20010023637A1 (en
Inventor
Lars Peter Klitmose
Henrik Ljunggreen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novo Nordisk AS
Original Assignee
Novo Nordisk AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novo Nordisk AS filed Critical Novo Nordisk AS
Priority to US09/808,497 priority Critical patent/US6474219B2/en
Assigned to NOVO NORDISK A/S reassignment NOVO NORDISK A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LJUNGGREEN, HENRIK, KLITMOSE, LARS PETER
Publication of US20010023637A1 publication Critical patent/US20010023637A1/en
Application granted granted Critical
Publication of US6474219B2 publication Critical patent/US6474219B2/en
Adjusted expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M5/14566—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons with a replaceable reservoir for receiving a piston rod of the pump
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/31518—Piston or piston-rod constructions, e.g. connection of piston with piston-rod designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/01—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like
    • B05C17/0113—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like the piston rod being flexible or articulated

Definitions

  • the invention relates to a flexible piston rod for an injection device, which piston rod has the form of a helical spring for moving a piston forward inside a cartridge containing a liquid.
  • the flexible piston rod transmits a movement from a piston rod drive to a longitudinal displacement of the piston; the flexible piston rod has a distal end abutting to the piston inside the cartridge, and a proximal end being deflected away from the axis of the cartridge.
  • the piston rod drive drives the flexible piston rod and comprises of a rotating nut element engaging the flexible piston rod.
  • Such flexible rods are E.g. used in the new generation of very short injection devices for distributing medicine into the body.
  • Some medication, such as insulin, is often self-administered.
  • the typical diabetes patients will require injections of insulin several times during the course of the day.
  • the amount of doses, and the size of each dose is usually prescribed for the individual patient, and it is a key issue for the health condition of the patients that the injection device is able to administer a very precise dose
  • WO 95/09021 shows a displacement system for controlled infusion of a liquid.
  • the flexible piston rod shown has in a preferred embodiment the form of a helical spring with narrowly adjacent turns of windings, which windings provides an external thread.
  • a piston rod drive is provided, which transmit a drive force to the piston through a nut element having an internal thread engaging the external thread of the flexible rod. By rotating the nut element, which is locked for axial movement, the flexible piston rod will drive the piston forward inside the cartridge.
  • a flexible piston rod having the form of a helical spring made up from a number of narrowly adjacent turns of windings providing an external thread, for moving a piston forward inside a cartridge containing a liquid, said flexible piston rod transmitting a movement from a piston rod drive to a longitudinal displacement of said piston, said flexible piston rod having a distal part abutting said piston inside said cartridge and a proximal part being deflected away from the axis of said cartridge, said piston rod drive including a nut element having an internal thread engaging said external thread of said flexible piston rod and which nut element is locked against longitudinal displacement and forcedly rotated,
  • the nut element has an internal thread corresponding to the external thread on the flexible piston rod. With the nut element locked against axial displacement, the rotation of the nut will advance the flexible piston rod moving the piston forward inside the cartridge.
  • a solution where an injection button worked by the fingers of the user drives the nut element would be very useful. It is however found most useful to use an electric motor, which through a suitable gearing can rotate the nut element.
  • the means locking the flexible piston rod against rotation is a longitudinal spine situated at the peripheral area of the helical spring forming the flexible piston rod. If the flexible piston rod forming a helical spring has such a spine, the rod will tend to fall into a predetermined position when ever bended. If the helical spring is deflected to follow an arc of a circle, the predetermined position will be one where the spine is situated on the inwardly pointing peripheral side of the bended spring. When rotating the nut element, the flexible piston rod will remain locked in this position, and the relation between the revolutions of the nut element and the advancement of the piston will be of a constant size depending purely on the pitch of the thread connection.
  • the helical spring has an initial tension and the spine is a removal or a reduction of the initial tension in a longitudinal area of the helical spring. Removing or reducing the build-in initial tension of the helical spring forming the flexible piston rod can introduce a displaced spine into the spring without physically changing the circular appearance of the spring. The initial tension is removed or reduced in a limited angular area of each winding, which areas together forms a straight longitudinal spinal area.
  • the spine is a depression in the out-turned peripheral area of each winding covering an angular part being substantial smaller than 360 degrees.
  • This depression making the spring non-circular is according to an appropriate embodiment of the invention introduced into the spring by applying a momentarily force or a pressure over an area on the out-turned peripheral area each winding.
  • the momentarily force or the pressure is applied by forcing said flexible piston rod over a relatively sharp edge. This forced a part of the pre-stressed windings back into a non-stressed position, thereby introducing a dislocated spine into the spring.
  • the spine is introduced into the helical spring by physical removing a part of the out-turned peripheral area of each winding covering an angular part being substantial smaller than 360 degrees.
  • the removing of the material forming the part of the spring to be removed is in a preferred embodiment of the flexible piston rod according to the invention done by grinding. By grinding a part of each winding of the helical spring away, the spring is given a noncircular appearance, with the chord of each winding together forming the longitudinal spine.
  • the spine is introduced into the helical spring when the spring is being coiled.
  • the windings are being coiled into a circular shape. If however they windings, and the spring, is given a different shape, a displaced spine can be introduced into the helical spring at this point.
  • FIG. 1 Schematically shows a displacement system having a flexible piston rod according to the invention.
  • FIG. 2 Shows a sectional view of the flexible piston rod along the line AA in FIG. 1 .
  • FIG. 3 Shows a perspective view of a displacement system having a flexible piston rod according to the invention.
  • distal end of the piston rod 4 is meant to refer to the end abutting the piston 3
  • proximal end is meant to refer to the opposite end
  • FIG. 1 shows schematically a displacement system for controlled infusion of a liquid.
  • a cartridge 1 is at one end closed by a closure enabling the mounting of a needle or a catheter 2 , which needle or catheter 2 is connected with a liquid medicine in the cartridge 1 .
  • the cartridge 1 is closed by a piston 3 , which by a flexible piston rod 4 may be pressed into the cartridge 1 to press out the liquid medicine through the needle or catheter 2 .
  • the distal end of the flexible piston rod 4 abuts the piston 3 , while the proximal end of the flexible piston rod 4 is deflected away from the axis of the cartridge 1 .
  • a piston washer can be provided between the piston 3 and the piston rod 4 .
  • the flexible piston rod 4 is made as a helical spring having a number of narrowly adjacent turns of windings abutting each other, which windings provide an external thread.
  • An ordinary helical compression spring 4 applies a constant force when the two ends of the spring 4 are pulled away from each other. When such a spring 4 is at rest i.e. no pulling is being executed, the force delivered by the spring 4 is normally zero. Helical compression springs 4 can however be produced with an initial tension. Springs of this type are often referred to as extension springs. By coiling one winding backwards and partly over the neighbouring winding when manufacturing the spring 4 , the spring 4 will be provided with a build-in initial tension. The backward pointing winding of the windings most be performed in a way keeping a constant diameter of the wound helix, therefore the initial tension, measured as the load needed to overcome the internal force and start coil separation, is generally designed as a few percent of maximum shear stress.
  • the piston drive 5 is made up from a nut element 6 , which is locked against axial displacement by a shoulder 7 in a not shown housing.
  • This nut element 6 has an internal thread engaging the external thread of the flexible piston rod 4 .
  • the nut element 6 is rotated by an electric motor 8 through a gearing wheel 9 .
  • the cartridge 1 and the piston drive 5 are mounted in a not shown housing so that they may not be displaced in relation to each other.
  • the flexible piston rod 4 is deflected away from the axis of the cartridge 1 . If the angle of deflection is 180 degrees the proximal part of the flexible piston rod is parallel with the distal part of the flexible piston rod. In this way the injection device can be made very short and very compact.
  • the bended part of the flexible piston rod being the part between the distal part and the proximal part, can be guided along a curved path 10 .
  • the helical spring 4 can contain a stiff wire, which is bended into the shape wanted, or the proximal part of the helical spring 4 can be provided with yet another not shown nut element secured in the housing against longitudinal displacement. If so wanted this second nut element can be driven by the same piston rod drive that drives the first nut element.
  • Such a rotation can be prevented by guiding an abutment on the spring 4 in a passage in the housing or in the curved path 10 .
  • Another way of preventing the rotation is by introducing a spine 11 into the flexible piston rod 4 . With a longitudinal spine 11 inserted in the peripheral side of the spring 4 , this spring will always situate itself, whenever bended, with the spine being situated on the inwardly pointing part 12 of the bended spring 4 , and at the same time the spine 11 will prevent the flexible piston rod 4 from rotating when a rotating force is being applied to the flexible piston rod 4 .
  • a longitudinal spine 11 can be introduced into the spring simply by deforming the spring 4 on an out-turned area of each winding, which area covers an angle substantial smaller than 360 degrees.
  • a permanently depression 11 of this type, making the spring non-circular, is schematically shown in FIG. 2 .
  • Applying a force, using an adequate tool, to the angular area could make a deformation or depression of the mentioned type, but such a deformation, restricted to a limited area of the spring, could also be made when coiling up the spring. Or it could be made by physically grinding away a part of the out-turned peripheral area of each winding.
  • the spring 4 is of the extension type having a build-in initial tension
  • simply reducing or removing the initial tension on a longitudinal area of the spring can introduce a spine 11 into the spring 4 , without physically changing the circular appearance of the spring 4 .
  • rotation of the bended spring 4 is made difficult due to the dislocated spine.
  • One way of removing the initial tension in an angular area of the helical spring 4 of the extension type is by applying a force to a limited angular part of the out-turned area of each winding, such a force can be applied by forcing the spring 4 over a relatively sharp edge, and thereby forcing a part of each of the backward pointing windings into a position eliminating the initial tension in that part of the winding. Together the part of each winding with no or reduced initial tension forms the longitudinal spine.

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  • Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Fluid-Damping Devices (AREA)
  • Actuator (AREA)
  • Coating Apparatus (AREA)
  • Organic Insulating Materials (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US09/808,497 2000-03-24 2001-03-14 Flexible piston rod Expired - Fee Related US6474219B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/808,497 US6474219B2 (en) 2000-03-24 2001-03-14 Flexible piston rod

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DKPA200000496 2000-03-24
DKPA200000496 2000-03-24
US19375600P 2000-03-31 2000-03-31
US09/808,497 US6474219B2 (en) 2000-03-24 2001-03-14 Flexible piston rod

Publications (2)

Publication Number Publication Date
US20010023637A1 US20010023637A1 (en) 2001-09-27
US6474219B2 true US6474219B2 (en) 2002-11-05

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US09/808,497 Expired - Fee Related US6474219B2 (en) 2000-03-24 2001-03-14 Flexible piston rod

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US (1) US6474219B2 (fr)
EP (1) EP1267963B1 (fr)
JP (1) JP2004504075A (fr)
KR (1) KR20020086680A (fr)
CN (1) CN1419459A (fr)
AT (1) ATE296649T1 (fr)
AU (2) AU2001242308B2 (fr)
CA (1) CA2403843A1 (fr)
DE (1) DE60111200T2 (fr)
DK (1) DK1267963T3 (fr)
ES (1) ES2243464T3 (fr)
IL (1) IL151817A0 (fr)
NO (1) NO20024547L (fr)
PL (1) PL363271A1 (fr)
PT (1) PT1267963E (fr)
RU (1) RU2257234C2 (fr)
TW (1) TW523415B (fr)
WO (1) WO2001072360A1 (fr)
ZA (1) ZA200207451B (fr)

Cited By (123)

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US20090198183A1 (en) * 2006-11-03 2009-08-06 Krumme John F Apparatus and methods for injecting dermal fillers
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RU2002128635A (ru) 2004-03-27
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US20010023637A1 (en) 2001-09-27
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KR20020086680A (ko) 2002-11-18
EP1267963B1 (fr) 2005-06-01
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PL363271A1 (en) 2004-11-15
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CA2403843A1 (fr) 2001-10-04
DE60111200D1 (de) 2005-07-07

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